Process of treatment of anode-slimes and similar materials.



F. C. RYAN.

PROCESS OF TREATMENT 0F ANODE SLIMES AND SIMILAR MATERIALS.

APPLICATION FILED FEB. 24. I9I4.

ffwfmwff ica FRANCIS C.

0F KEW JERSEY.

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'l mei tage 0: 1511i JUS@ (lust f Silver and other v The omleff 'neve a matar to diam* wat mowad mais w by mlmng carbon 0r.' beow a dull red arsemc water fol presence of sulfuric acid to sulfate the silver and copper for separation from the unsoluble gold.

2. The method of treating mineral bearing material containing arsenic, selenium, gold, silver, copper and the like, comprising roasting the slime With sodium carbonate at a temperature which will complete the re-' action of the materials before the mass sinters, leaching the sintered mass, filtering to remove arsenic and selenium, and .roasting the residue in an oxidizing roast in the presence of sulfuric acid to sulfate the silver and copper, and separating the gold from the silver and copper.

3. The method of treating mineral bearing material containing arsenic, selenium, bismuth, antimony, gold, silver, copper and the like, comprising roasting` the material `with an alkali carbonate, leaching and filtering the roasted material tolemove selenium and arsenic, roasting the' residue free of arsenic and selenium with sulfuric acid, and treating with water to precipitate the sulfates of bismuth and antimony, filtering and treating the filtrate to recover silver.

4. The method of treating mine-ral bearingl material containing arsenic, selenium, gold, silver, copper, bismuth, tellurium, antimony and the like, comprising roasting the material with an alkali carbonate, leaching and filtering the material to remove arsenic and selenium, roasting the filtered residue with sulfuric acid, and treating the roasted material with sutlicient Water to dissolve the copper and silver and precipitate the basic sulfates of antimony and bismuth, filtering to separate the gold, antimony and bismuth from the copper and silver in solution and treating the solution with sodium chlorid to precipitate silver.

5. The method of treating mineral bearing material containing arsenic, selenium, gold, silver, copper, bismuth, tellurium, antimony and the like, comprising roasting the material with an alkali carbonate at a temperature low enough to complete the re FRANCIS C. RYAN. Witnesses: I

W. H. GonTLis, Jr., Jol-1N N. BEUKMAN. 

